diff --git a/mozilla/modules/plugin/base/src/ns4xPlugin.cpp b/mozilla/modules/plugin/base/src/ns4xPlugin.cpp
index a4796141d85..631bc2eb122 100644
--- a/mozilla/modules/plugin/base/src/ns4xPlugin.cpp
+++ b/mozilla/modules/plugin/base/src/ns4xPlugin.cpp
@@ -96,6 +96,7 @@ NS_IMPL_RELEASE(ns4xPlugin);
 
 static NS_DEFINE_IID(kILiveConnectPluginIID, NS_ILIVECONNECTPLUGIN_IID); 
 static NS_DEFINE_IID(kIPluginIID, NS_IPLUGIN_IID); 
+static NS_DEFINE_IID(kIFactoryIID, NS_IFACTORY_IID);
 static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
 static NS_DEFINE_IID(kIWindowlessPluginInstancePeerIID, NS_IWINDOWLESSPLUGININSTANCEPEER_IID);
 static NS_DEFINE_IID(kISeekablePluginStreamPeerIID, NS_ISEEKABLEPLUGINSTREAMPEER_IID);
@@ -125,6 +126,13 @@ ns4xPlugin::QueryInterface(const nsIID& iid, void** instance)
         return NS_OK;
     }
 
+    if (iid.Equals(kIFactoryIID))
+    {
+        *instance = (void *)(nsIFactory *)this;
+        AddRef();
+        return NS_OK;
+    }
+
     if (iid.Equals(kISupportsIID))
     {
         *instance = (void *)(nsISupports *)this;
diff --git a/mozilla/modules/plugin/nglsrc/ns4xPlugin.cpp b/mozilla/modules/plugin/nglsrc/ns4xPlugin.cpp
index a4796141d85..631bc2eb122 100644
--- a/mozilla/modules/plugin/nglsrc/ns4xPlugin.cpp
+++ b/mozilla/modules/plugin/nglsrc/ns4xPlugin.cpp
@@ -96,6 +96,7 @@ NS_IMPL_RELEASE(ns4xPlugin);
 
 static NS_DEFINE_IID(kILiveConnectPluginIID, NS_ILIVECONNECTPLUGIN_IID); 
 static NS_DEFINE_IID(kIPluginIID, NS_IPLUGIN_IID); 
+static NS_DEFINE_IID(kIFactoryIID, NS_IFACTORY_IID);
 static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
 static NS_DEFINE_IID(kIWindowlessPluginInstancePeerIID, NS_IWINDOWLESSPLUGININSTANCEPEER_IID);
 static NS_DEFINE_IID(kISeekablePluginStreamPeerIID, NS_ISEEKABLEPLUGINSTREAMPEER_IID);
@@ -125,6 +126,13 @@ ns4xPlugin::QueryInterface(const nsIID& iid, void** instance)
         return NS_OK;
     }
 
+    if (iid.Equals(kIFactoryIID))
+    {
+        *instance = (void *)(nsIFactory *)this;
+        AddRef();
+        return NS_OK;
+    }
+
     if (iid.Equals(kISupportsIID))
     {
         *instance = (void *)(nsISupports *)this;